Puck, in medieval English folklore, a maliciousfairy or demon. In Old and Middle English the word meant simply “demon.” In Elizabethan lore he was a mischievous, brownielike fairy also called Robin Goodfellow, or Hobgoblin. As one of the leading characters in William Shakespeare’sMidsummer Night’s Dream, Puck boasts of his pranks of changing shapes, misleading travelers at night, spoiling milk, frightening young girls, and tripping venerable old dames. The Irish pooka, or púca, and the Welsh pwcca are similar household spirits.

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comedy in five acts by William Shakespeare, written about 1595–96 and published in 1600 in a quarto edition from the author’s manuscript, in which there are some minor inconsistencies. The version published in the First Folio of 1623 was taken from a second quarto edition, with some...